Lenze ECSDKxxx - Manual (Page 41)

Safety instructions
Residual hazards
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41 EDKCSDK002 DE/EN/FR 1.1
1.2 Residual hazards
Protection of persons
ƒ Before working on the capacitor module, check that no voltage is applied to
the power terminals,
– because the power terminals +UG and −UG at the supply module remain
live for at least 3 minutes after mains switch−off.
– because the power terminals +UG and −UG remain live when the motor is
stopped.
ƒ If an error occurs (short circuit to frame or earth fault) a DC residual current
may occur in the PE conductor. If an earth−leakage circuit breaker (residual
current device) is used to protect against direct or indirect contact, only the
use of an earth−leakage circuit breaker of type B is permissible on the current
supply side. If not, another protective measure is to be used, as for example,
separation from the environment by double or reinforced insulation or
separation from the mains by using a transformer.
Device protection
ƒ All pluggable connection terminals must only be connected or disconnected
when no voltage is applied.
ƒ The power terminals +UG, −UG and PE are not protected against polarity
reversal.
– When wiring, observe the polarity of the power terminals.
ƒ The power may only be converted if the power supply module in the power
system is ready for operation and the charging current limitation is bridged.
Otherwise the charging current limitation can be destroyed.
ƒ If the charging current limitation is active, a cyclic switching of the mains
voltage at the power supply module can overload and destroy the capacitor.
Therefore, at least three minutes have to pass between two starting
operations in case of cyclic mains switching over a longer period of time.